1. Determine the low pressure oil inlet (1) When there is air in the low pressure oil line, loosen the fuel pump bleeder screw, and the hand pump will continue to pump oil. If the bubbles can be drained, it means that the oil pump outlet to spray There is air intake between the pumps. If there is no oil discharge or the bubbles in the oil are always inexhaustible, it means that the fuel tank is connected to the inlet port of the fuel pump, and a separate oil pipe is separately inserted into the oil tank. Then the oil pump is used to pump oil. If the air bubbles in the oil line can be exhausted , indicating that the above judgment is correct. As for the specific leak location can be used to pressurize the tank or use tape to wrap suspicious parts of the method to determine.
(2) During work, when the needle seat sealing conical surface of a cylinder injector is excessively worn or due to too much coke, the needle valve is not closed tightly, and the high-pressure gas in the cylinder passes through the sealing cone through the nozzle hole. The surface, through the micro-gap of the needle valve, enters the injector chamber. If the return line of the model injector is connected to the fuel filter, then the air will enter the fine filter through the return line. In this way, each compressed row of the piston in the cylinder will inflate the fine filter once. The gas in the filter will accumulate more and more, and when it accumulates to a certain extent, there will be air in the fuel pump, forming an air resistance. The method for judging this air intake is to loosen or remove the joint screw that connects the injector's total return pipe to the filter, exhaust the air, and start the diesel engine. If the fuel injection pump no longer has air, the engine sounds normal. , it can be concluded that the injector is leaking. If you want to further determine which injector is leaking, you can loosen the hollow screw of the single injector return pipe. If air bubbles emerge, you can conclude that the injector is leaking.
2. Determine the blockage of the low pressure oil line Loosen the bleeder screw on the fuel pump and pull the handle of the hand pump. The diesel should be sprayed out regularly and regularly with the hand pump. Otherwise, the oil line is not open. According to the feel of the hand pressure pump handle, it is possible to determine the blockage. If you feel a lot of effort when you pull the handle of the hand pump, it is usually blocked by the oil line before the pump. The common plugging sites include the fuel tank outlet pipe, the strainer filter, and the oil pump inlet filter. The specific blockage area can be found by blowing gas from different locations into the tank. For example, blowing air from the fuel inlet pipe to the tank does not hear bubbling noise, and blowing air to the tank at the prefilter inlet pipe can hear bubbling noise, indicating that the clogging generator is in the prefilter. If you feel the resistance when you press the hand pump hand or handle, and the oil is smooth after you loosen the oil filter inlet connector, the blockage occurs at the filter element of the fuel filter.
3. Inspection of the status of the fuel pump outlet valve Remove the high pressure fuel line from the joint nut on the end of the injection pump, and use the hand pump to pump oil. Observe that there is oil spillage in the oil outlet hole of each high pressure oil pipe connector. If there is oil spillage in the high pressure tubing connector of a cylinder, the cylinder outlet valve is not sealed or the outlet valve spring is broken.
4. Inspection of fuel injection pressure and spray quality Under the condition of no injector tester, the vehicle can be used to compare the fuel injectors with the standard injectors by using “T†joints to check the injection pressure. And injection quality. Remove the fuel injector to be inspected and the high-pressure fuel pipe of the cylinder, and connect the injector to one end of the “T†shaped high-pressure fuel pipe. The other end of the “T†shaped high-pressure fuel pipe is equipped with a pre-adjusted standard. Injector, then install one end of the “T†high pressure fuel pipe to the fuel injection pump, add the throttle to the maximum, loosen the high pressure fuel lines of other cylinders, and start the engine with the starter to observe the fuel injection of the injector. If two injectors do not spray at the same time, the injector pressure of the injector being checked should be adjusted so that the two injectors simultaneously inject fuel. If the injector spray is checked for poor spray quality, it should be overhauled.
5. Checking the state of the plunger. The wear of the plunger is one of the important causes of diesel engine failure. The leakage of the diesel after the wear of the plunger is increased, so that the circulating oil supply is reduced, and the injection advance angle is also reduced, resulting in insufficient power of the diesel engine and difficulty in starting. Has the plunger coupling been worn out to the point where it cannot be used? How can you check it in an easy way? There are some popular books that are irresponsibly introduced: “Closing the plunger sleeve with the fingers in and out of the oil hole and the top hole, pulling the plunger to a certain distance, letting go, and if the plunger can be retracted automatically, it shows that the wear is not enough. Seriously.†This statement is completely wrong and the plunger couple that wears very seriously can meet this requirement. You can use a doctor's Syringe or even a child's water gun to test, block the exit, pull the core, and let it go. The core will be retracted immediately. So what is the recommended method without an instrument? We recommend the "naked eye" method. The condition of the local wear of the plunger head was observed with the naked eye, and the most worn area was where the oil inlets were often faced during work. The surface of the scratch line on the surface of the scratch line is deep and shallow, coarse and thin, and the wear area is milky white. The fingernail is used to scrape and feel slightly. When the scratch surface is wide and the nail feels obvious Can't use it anymore.
(2) During work, when the needle seat sealing conical surface of a cylinder injector is excessively worn or due to too much coke, the needle valve is not closed tightly, and the high-pressure gas in the cylinder passes through the sealing cone through the nozzle hole. The surface, through the micro-gap of the needle valve, enters the injector chamber. If the return line of the model injector is connected to the fuel filter, then the air will enter the fine filter through the return line. In this way, each compressed row of the piston in the cylinder will inflate the fine filter once. The gas in the filter will accumulate more and more, and when it accumulates to a certain extent, there will be air in the fuel pump, forming an air resistance. The method for judging this air intake is to loosen or remove the joint screw that connects the injector's total return pipe to the filter, exhaust the air, and start the diesel engine. If the fuel injection pump no longer has air, the engine sounds normal. , it can be concluded that the injector is leaking. If you want to further determine which injector is leaking, you can loosen the hollow screw of the single injector return pipe. If air bubbles emerge, you can conclude that the injector is leaking.
2. Determine the blockage of the low pressure oil line Loosen the bleeder screw on the fuel pump and pull the handle of the hand pump. The diesel should be sprayed out regularly and regularly with the hand pump. Otherwise, the oil line is not open. According to the feel of the hand pressure pump handle, it is possible to determine the blockage. If you feel a lot of effort when you pull the handle of the hand pump, it is usually blocked by the oil line before the pump. The common plugging sites include the fuel tank outlet pipe, the strainer filter, and the oil pump inlet filter. The specific blockage area can be found by blowing gas from different locations into the tank. For example, blowing air from the fuel inlet pipe to the tank does not hear bubbling noise, and blowing air to the tank at the prefilter inlet pipe can hear bubbling noise, indicating that the clogging generator is in the prefilter. If you feel the resistance when you press the hand pump hand or handle, and the oil is smooth after you loosen the oil filter inlet connector, the blockage occurs at the filter element of the fuel filter.
3. Inspection of the status of the fuel pump outlet valve Remove the high pressure fuel line from the joint nut on the end of the injection pump, and use the hand pump to pump oil. Observe that there is oil spillage in the oil outlet hole of each high pressure oil pipe connector. If there is oil spillage in the high pressure tubing connector of a cylinder, the cylinder outlet valve is not sealed or the outlet valve spring is broken.
4. Inspection of fuel injection pressure and spray quality Under the condition of no injector tester, the vehicle can be used to compare the fuel injectors with the standard injectors by using “T†joints to check the injection pressure. And injection quality. Remove the fuel injector to be inspected and the high-pressure fuel pipe of the cylinder, and connect the injector to one end of the “T†shaped high-pressure fuel pipe. The other end of the “T†shaped high-pressure fuel pipe is equipped with a pre-adjusted standard. Injector, then install one end of the “T†high pressure fuel pipe to the fuel injection pump, add the throttle to the maximum, loosen the high pressure fuel lines of other cylinders, and start the engine with the starter to observe the fuel injection of the injector. If two injectors do not spray at the same time, the injector pressure of the injector being checked should be adjusted so that the two injectors simultaneously inject fuel. If the injector spray is checked for poor spray quality, it should be overhauled.
5. Checking the state of the plunger. The wear of the plunger is one of the important causes of diesel engine failure. The leakage of the diesel after the wear of the plunger is increased, so that the circulating oil supply is reduced, and the injection advance angle is also reduced, resulting in insufficient power of the diesel engine and difficulty in starting. Has the plunger coupling been worn out to the point where it cannot be used? How can you check it in an easy way? There are some popular books that are irresponsibly introduced: “Closing the plunger sleeve with the fingers in and out of the oil hole and the top hole, pulling the plunger to a certain distance, letting go, and if the plunger can be retracted automatically, it shows that the wear is not enough. Seriously.†This statement is completely wrong and the plunger couple that wears very seriously can meet this requirement. You can use a doctor's Syringe or even a child's water gun to test, block the exit, pull the core, and let it go. The core will be retracted immediately. So what is the recommended method without an instrument? We recommend the "naked eye" method. The condition of the local wear of the plunger head was observed with the naked eye, and the most worn area was where the oil inlets were often faced during work. The surface of the scratch line on the surface of the scratch line is deep and shallow, coarse and thin, and the wear area is milky white. The fingernail is used to scrape and feel slightly. When the scratch surface is wide and the nail feels obvious Can't use it anymore.
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